Any info on the '15 independent rear susp.?

Wild Horses

Active Member
Joined
Jan 14, 2014
Messages
791
Reaction score
13
I read about the car in the new fast fords magazine and had no idea that the stang is finally getting an independent rear suspension!!!! I wonder if top gear will have trash to talk about this one....

Anyway. I kinda want to see pictures of this setup. I'm a welder and fabricator and if any mounting points on the '15s chassis is at all similar to the SN platform I'd need to make it work. I love straight line racing as much as the next guy but nothing compares to carving corners in a mustang gt. And I can still be competitive in my NPI car. Lol.
 

white95

Apex Junky
Admin
Joined
Dec 30, 2007
Messages
17,279
Reaction score
3,959
Location
Prairieville, LA
2015-Mustang-Undercarriage-2-785x510.jpg
 

Wild Horses

Active Member
Joined
Jan 14, 2014
Messages
791
Reaction score
13
Doesn't seem impossible. Lots of fab work but do-able. Coil overs would save on room. I'll wait for a wrecked one to come into the body shop for a close up.
 

SVTstang96

Well-Known Member
Joined
Jan 26, 2010
Messages
1,262
Reaction score
6
Location
Dubuque, Iowa
Doesn't seem impossible. Lots of fab work but do-able. Coil overs would save on room. I'll wait for a wrecked one to come into the body shop for a close up.

If you want IRS in a SN95 chassis why don't you just get a 99-04 Cobra IRS? Bolts right in and the 03-04 ones are pretty strong from the factory. 31 spline axle/diff and 3.55 gears
 

Wild Horses

Active Member
Joined
Jan 14, 2014
Messages
791
Reaction score
13
If you want IRS in a SN95 chassis why don't you just get a 99-04 Cobra IRS? Bolts right in and the 03-04 ones are pretty strong from the factory. 31 spline axle/diff and 3.55 gears

Had no idea they had IRS. Is it true independent? I'm not very knowledgeable about cobra specifics. That sounds like something that could be done on my daily/weekend cone dodger. I'm going to look into that seriously.

This thread is just based on a weird idea.
 

CC'S95GT

Post Whore
Joined
Apr 19, 2008
Messages
10,738
Reaction score
172
Location
Hampton ,Ga.
there's been about 6 or so members that have done the swap and polished the exhaust too.
 

Mustanger

Well-Known Member
Joined
Dec 3, 2006
Messages
2,310
Reaction score
115
Location
Southern Oregon
Front frame SFC'S? What are those? Don't you use full length subframe connectors? Or add the side brace triangulated stiffeners to those? Just curious, you lost me...
 

OnyxCobra

Post Whore
Joined
Apr 8, 2006
Messages
14,794
Reaction score
233
Location
Rochester, NY
the IRS in the 03/04 Cobras was never a good example of IRS, it actually wasn't very strong because of wheel hop in stock form. it's also not exactly bolt in.

the new IRS should be worlds better, the rumor is the new GT will be faster around a track than the old Boss. It should be a pretty sick suspension.
 

Wild Horses

Active Member
Joined
Jan 14, 2014
Messages
791
Reaction score
13
Front frame SFC'S? What are those? Don't you use full length subframe connectors? Or add the side brace triangulated stiffeners to those? Just curious, you lost me...

Lost by lack of comma. My bad Ha. >>>Front suspension, SFCs, and aluminum diet.
 

Wild Horses

Active Member
Joined
Jan 14, 2014
Messages
791
Reaction score
13
the IRS in the 03/04 Cobras was never a good example of IRS, it actually wasn't very strong because of wheel hop in stock form. it's also not exactly bolt in.

the new IRS should be worlds better, the rumor is the new GT will be faster around a track than the old Boss. It should be a pretty sick suspension.

Now it's still a hell of a step up from a solid axle, but I knew it'd be a much bigger deal if it were a true IRS. Its our American version of RWD IRS I guess that's how you could compare it. It's how I see it at least. Make sense? IDK either.

On to the '15, from what I can gather this sucker is gonna be nasty on the road course. I want to buy one, then run laps at summit point until I break it, then push it out on the street... And have NO CLUE why the brakes are melted, all 4 tires are bald, and it won't start when I call AAA.
 

Mystic SVT

Active Member
Joined
May 7, 2010
Messages
473
Reaction score
25
the IRS in the 03/04 Cobras was never a good example of IRS, it actually wasn't very strong because of wheel hop in stock form. it's also not exactly bolt in.

The 03-04 IRS was the strongest one made, the weakest was the '99. And as far as the 03-04 IRS not being strong I beg to differ...

http://www.youtube.com/watch?v=cZ9LkCyVU20

Skip to 1:35 mark
http://www.youtube.com/watch?v=zRXU8rUPVeM

http://www.youtube.com/watch?v=F9qMoFSLgGw

All cobras running 9's with the factory IRS, modded of course with new stiffer bushings. There are many more running 10's also.

All that is needed for the 03-04 IRS is to replace the stock factory rubber bushings with Full Tilt Boogie Racing's kit. I have installed this kit on two 03-04 cobras and the difference was night and day. What breaks halfshafts/diffs is wheelhop but thats with any IRS, look at the CTSV, GTO, Camaro.

As far as it not being "exactly a bolt in", well that's nothing a weekend can't take care of. All that is needed is to make new rear brake lines, drill a few holes, swap a u-joint. A lot better than trying to make an IRS designed for a car designed on a new platform for 2015 unlike the Cobra IRS which was designed to bolt into a frame design that came out in the late 70's. Plus, the new 2015 car has a MUCH wider track than the 99-04 cars which already had a wider track than 94-98 cars.
 

OnyxCobra

Post Whore
Joined
Apr 8, 2006
Messages
14,794
Reaction score
233
Location
Rochester, NY
Yeah you took that too much to heart, I should have rephrased my statement. In stock form with wheel hop it'll snap a half shaft (which is what i mentioned specifically), that's obviously the first thing to remedy. Besides that being 31 spline it should be quite strong.

Yes it will install somewhat easily but it's not bolt in. technically you may need a shorter driveshaft for the IRS swap as well. Did you have to drop the gas tank to drill any of the mounting holes?
 

Mystic SVT

Active Member
Joined
May 7, 2010
Messages
473
Reaction score
25
Didn't take it too much to heart, just wanted to clear up that the 03-04 IRS is not weak, just has very soft bushings from the factory which cause wheelhop which like you said...breaks parts.

Dropped gas tank, used alum driveshaft made for SRA (fits snuggly), made new rear brake lines which was very easy, and also took out all the slack from my emergency cables where they run thru the floor/subframe so they would fit onto the hub assembly/calipers correctly. IRS cobra used a slightly longer emergency brake cable but mine work just fine.
 

Latest posts

Forum statistics

Threads
74,481
Messages
1,447,395
Members
13,362
Latest member
CampTheChamp

Members online

Top